JP2006315287A - Ball-point pen - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To eliminate a fear that the inks in refiles are not sufficiently pressurized when push-action members are completely depressed downward to its tip end side. <P>SOLUTION: The ball-point pen is provided with a plurality of refiles 1A, 1B, pressurizing mechanisms 3A, 3B for pressurizing the ink in the refiles 1A, 1B, and the push-action members 8A, 8B, 9A, 9B which move the refiles 1A, 1B to the tip end side and are depressed downward to the tip end side for operating the pressurizing mechanisms 3A, 3B. The ball-point pen includes first springs 11A, 11B for urging the refiles 1A, 1B and the cylinder sections 4A, 4B of the pressurizing mechanisms 3A, 3B to the rear end side, and second springs 12A, 12B for urging the push-action members 8A, 8B, 9A, 9B and the piston sections 5A, 5B of the pressurizing mechanisms 3A, 3B to the rear end side, wherein the spring constant of the second springs 12A, 12B is made smaller than that of the first springs 11A, 11B. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention includes a plurality of refills, a pressurizing mechanism for pressurizing ink in the refills, and a knocking member that moves the refill to the front end side and is pushed down to the front end side to operate the pressurization mechanism. With respect to the ballpoint pen, in particular, it is possible to eliminate the possibility that the ink in the refill is not sufficiently pressurized when the knock member is completely pushed down to the front end side and the movement of the refill to the front end side is completed. Regarding ballpoint pens.

  Conventionally, a plurality of refills, a pressurizing mechanism for pressurizing ink in the refills, and a knock bar (knock member) that is moved down to the front end side and moves the refill to the front end side and is pushed down to the front end side to operate the pressurization mechanism. There is known a ballpoint pen comprising: An example of this type of ballpoint pen is described in, for example, Japanese Patent Application Laid-Open No. 2004-314379.

  In the ballpoint pen described in Japanese Patent Application Laid-Open No. 2004-314379, a plurality of refills are provided, and at least one of the plurality of refills is provided with a pressurizing mechanism for pressurizing ink in the refills. Specifically, in the ballpoint pen pressurizing mechanism described in Japanese Patent Application Laid-Open No. 2004-314379, a space part (cylinder part) communicated with the inside of the refill to be pressurized, and air in the space part (cylinder part) And a piston portion that is integrated with a knock bar (knock member).

  Further, in the ballpoint pen described in Japanese Patent Application Laid-Open No. 2004-314379, when the knock bar (knock member) is pushed down to the tip side, the pressurizing mechanism is actuated to pressurize the ink in the refill and refill the refill. Is moved to the tip side.

  However, in the ballpoint pen described in Japanese Patent Application Laid-Open No. 2004-314379, as described in paragraph [0017] of Japanese Patent Application Laid-Open No. 2004-314379, when the knock bar (knock member) is pushed down to the tip side, First, the refill is moved to the tip side, and the tip attached to the tip of the refill is projected from the ballpoint pen body. Next, when the knock bar (knock member) is further pushed down to the tip side, the pressure mechanism is actuated and the ink in the refill is pressurized.

  That is, in the ballpoint pen described in Japanese Patent Application Laid-Open No. 2004-314379, after the tip of the refill is protruded from the ballpoint pen body, the ink in the refill is pressurized.

  On the other hand, in Japanese Patent Application Laid-Open No. 2004-314379, after the tip of the refill is protruded from the ballpoint pen body, when the ink in the refill is pressurized, the refill is abutted against the tip side and stopped. It is not disclosed whether or not.

  Therefore, in the ballpoint pen described in Japanese Patent Application Laid-Open No. 2004-314379, it is assumed that the refill is not abutted against the tip side when the ink in the refill is pressurized, If the spring pressure of the spring for urging the rod (knock member) toward the rear end is greater than the designed spring pressure due to manufacturing variations, etc., the knock rod (knock member) When the tip of the refill is pushed down completely and the tip of the refill is protruded from the ballpoint pen body, that is, when the ballpoint pen is used, the distance between the knock bar (knock member) and the refill becomes larger than the design value. There is a possibility that the ink in the refill is not sufficiently pressurized.

JP 2004-314379 A

  In view of the above-described problems, the present invention is concerned that the ink in the refill may not be sufficiently pressurized when the knock member is completely pushed down toward the tip and the tip at the tip of the refill is protruded from the ballpoint pen body. An object of the present invention is to provide a ballpoint pen that can eliminate the above.

  In other words, the present invention can eliminate the possibility that the ink in the refill is not sufficiently pressurized when the knock member is completely pushed down to the front end side and the movement of the refill to the front end side is completed. The object is to provide a ballpoint pen.

  According to the first aspect of the present invention, a plurality of refills, a pressurizing mechanism for pressurizing the ink in the refills, a tip for moving the refills to the tip side and operating the pressurizing mechanism. In a ballpoint pen having a knock member pushed down to the side, when the knock member is pushed down to the tip side, first, pressurization of the ink in the refill is completed by the pressure mechanism, and then the knock When the member is further pushed down to the tip side, the refill is moved to the tip side, and a ballpoint pen is provided.

  According to the second aspect of the present invention, a plurality of refills, a pressurizing mechanism for pressurizing ink in the refills, a tip for moving the refills to the tip side and operating the pressurization mechanism In a ballpoint pen comprising a knock member pushed down to the side, a first spring for urging the refill and the cylinder part of the pressure mechanism toward the rear end side, and the knock member and the piston part of the pressure mechanism There is provided a ballpoint pen provided with a second spring for biasing to the rear end side, wherein the spring constant of the second spring is made smaller than the spring constant of the first spring.

  According to the invention of claim 3, the tip of the first spring is supported by a ballpoint pen housing or a spring seat fixed to the ballpoint pen housing, the rear end of the first spring is supported by the cylinder portion, 4. The ballpoint pen according to claim 3, wherein a tip end of a second spring is supported by the cylinder portion, and a rear end of the second spring is supported by the knock member or the piston portion.

  According to the fourth aspect of the present invention, a plurality of refills, a pressurizing mechanism for pressurizing ink in the refills, a tip for moving the refills to the tip side and operating the pressurizing mechanism. In a ballpoint pen having a knock member pushed down to the side, the stroke amount of the knock member from the position returned to the rear end side to the position completely pushed down to the front end side, and the position returned to the rear end side The difference from the stroke amount of the refill up to the position moved to the most distal side is equal to or greater than the stroke amount of the piston portion with respect to the cylinder portion of the pressurizing mechanism required to pressurize the ink in the refill. In addition, a ballpoint pen is provided, which is provided with a restricting means for restricting the movement of the refill to the tip side.

  According to a fifth aspect of the present invention, there is provided the ballpoint pen according to the fourth aspect, wherein the restricting means is arranged at the tip of the ballpoint pen housing.

  According to the sixth aspect of the present invention, the sealing surface for pressurizing the ink in the refill is constituted by two planes, that is, the end surface of the piston portion of the pressurizing mechanism and the seating surface of the cylinder portion of the pressurizing mechanism. A ballpoint pen according to any one of claims 1 to 5 is provided.

  In the ballpoint pen according to claim 1, when the knock member is pushed down to the front end side, first, pressurization of the ink in the refill is completed by the pressurizing mechanism, and then the knock member is further pushed down to the front end side. Then, the refill is moved to the tip side.

  In other words, in the ballpoint pen according to claim 1, before the knock member is completely pushed down toward the tip side, the pressurization of the ink in the refill is completed by the pressurization mechanism, and the pressurization of the ink in the refill is performed. After the completion, the knock member is further pushed down to the tip side, whereby the refill is moved to the tip side.

  Therefore, according to the ballpoint pen described in claim 1, the ink in the refill is not sufficiently pressurized when the knock member is completely pushed down to the tip side and the movement of the refill to the tip side is completed. Fear can be eliminated.

  In the ballpoint pen according to claim 2, the first spring for urging the refill and the cylinder portion of the pressure mechanism toward the rear end side, and the urging force of the knock member and the piston portion of the pressure mechanism toward the rear end side. And the second spring has a spring constant smaller than that of the first spring.

  Specifically, in the ballpoint pen according to claim 2, when the knock member is pushed down to the tip side by the first pressing force, first, the second spring is compressed until the piston portion hits the cylinder portion. Thus, the pressurization of the ink in the refill is completed, and then, when the knock member is further pushed down to the tip side by the second pressing force larger than the first pressing force, the first spring is compressed, thereby The spring constant of the second spring is made smaller than the spring constant of the first spring so that the refill can be moved to the tip side.

  That is, according to the ballpoint pen of the second aspect, when the knock member is completely pushed down toward the tip side by a simple method of managing the spring constant of the first spring and the spring constant of the second spring, The fear that the ink is not sufficiently pressurized can be eliminated.

  That is, according to the ballpoint pen of the second aspect, the ink in the refill is not sufficiently pressurized when the knock member is completely pushed down to the tip side and the movement of the refill to the tip side is completed. Fear can be eliminated.

  4. The ballpoint pen according to claim 3, wherein the tip end of the first spring is supported by a ballpoint pen housing or a spring seat fixed to the ballpoint pen housing, the rear end of the first spring is supported by the cylinder portion, and the tip end of the second spring is the cylinder. The rear end of the second spring is supported by a knock member or a piston portion.

  That is, in the ballpoint pen according to the third aspect, the tip of the second spring is supported by the ballpoint pen housing or the spring seat fixed to the ballpoint pen housing in order to prevent the outer diameter of the ballpoint pen from being increased. Instead, it is supported by a cylinder portion having a smaller diameter than those.

  In the ballpoint pen configured as described above, if the spring constant of the second spring is larger than the spring constant of the first spring due to variations in manufacturing, etc., when the knock member is completely pushed down to the tip side, There is a possibility that the second spring is not sufficiently compressed, and accordingly, the ink in the refill is not sufficiently pressurized.

  Therefore, in the ballpoint pen according to claim 3, the spring constant of the second spring is set to the first spring so that the second spring is sufficiently compressed when the knock member is completely pushed down toward the tip side. Is smaller than the spring constant.

  In other words, in the ballpoint pen according to the third aspect, the knock member is completely pushed down toward the tip end side as the tip end of the second spring is supported by the cylinder portion in order to suppress an increase in the outer diameter of the ballpoint pen. It is possible to reliably avoid the possibility that sometimes the ink in the refill is not sufficiently pressurized.

  In the ballpoint pen according to claim 4, the stroke amount of the knock member from the position returned to the rear end side to the position completely pushed down to the front end side and the position moved back to the rear end side are moved to the most front end side. The difference between the stroke amount of the refill up to the crimped position and the stroke amount of the piston portion with respect to the cylinder portion of the pressure mechanism necessary to pressurize the ink in the refill is greater than the stroke amount of the refill to the tip side. Restriction means for restricting movement is provided.

  Specifically, in the ballpoint pen according to claim 4, when the knock member is completely pushed down to the tip side, the refill is moved to the most tip side, and the movement of the refill to the tip side is regulated by the regulating means. The stroke amount of the piston portion relative to the cylinder portion is greater than or equal to the stroke amount necessary to pressurize the ink in the refill.

  Therefore, according to the ballpoint pen described in claim 4, when the knock member is completely pushed down to the tip side by a simple method of providing a restricting means for restricting the movement of the refill to the tip side, The fear that the ink is not sufficiently pressurized can be eliminated.

  In other words, according to the ballpoint pen described in claim 4, when the knock member is completely pushed down to the tip side and the movement of the refill to the tip side is completed, the ink in the refill is not sufficiently pressurized. Fear can be eliminated.

  In the ballpoint pen according to the fifth aspect, the restricting means for restricting the movement of the refill to the tip side is arranged at the tip of the ballpoint pen housing. Specifically, the restricting means is disposed at the tip of the ballpoint pen housing through which any of the plurality of refills can pass. Therefore, it is possible to reduce the cost required for providing the restricting means, compared to the case where a plurality of restricting means are provided corresponding to each of the plurality of refills in order to restrict movement of the plurality of refills to the tip side. it can.

  In the ballpoint pen according to the sixth aspect of the present invention, the sealing surface for pressurizing the ink in the refill is constituted by two planes, that is, the end surface of the piston portion of the pressurizing mechanism and the seating surface of the cylinder portion. Therefore, the reliability of the sealing surface can be improved as compared with the ballpoint pen described in Japanese Patent Application Laid-Open No. 2004-314379 in which the sealing surface for pressurizing the ink in the refill is configured by a curved surface (cylindrical surface). .

  Specifically, in the ballpoint pen described in Japanese Patent Application Laid-Open No. 2004-314379, when the seal ring is deteriorated with time or deformed with a temperature change, the outer peripheral surface of the seal ring and the space portion (cylinder portion) Whereas the sealing surface may not be formed by the inner peripheral surface, in the ballpoint pen according to claim 6, even when the piston portion deteriorates with time or is deformed with a temperature change. A sealing surface can be formed by the end surface of the piston portion and the seating surface of the cylinder portion. That is, the reliability of the sealing surface can be improved as compared with the ballpoint pen described in Japanese Patent Application Laid-Open No. 2004-314379.

  Hereinafter, a first embodiment of the ballpoint pen of the present invention will be described. FIG. 1 is a cross-sectional view of the ballpoint pen according to the first embodiment. Specifically, FIG. 1A shows a state in which the ink in the refills 1A and 1B is not pressurized, and FIG. 1B shows the state in which the ink in the refill 1A is pressurized and the ink in the refill 1B. It is the figure which showed the state which is not pressurized. In FIG. 1, 2A shows a chip integrated with a refill 1A filled with black ink, for example, and 2B shows a chip integrated with a refill 1B filled with red ink, for example. Yes. In the ballpoint pen of the first embodiment, oil-based ink is filled in the refills 1A and 1B. However, in the ballpoint pen of the second embodiment, for example, neutral ink and a grease-like follower are refilled instead of the oil-based ink. It is also possible to fill in 1A and 1B.

  In FIG. 1, 3A indicates a pressurizing mechanism for pressurizing the ink in the refill 1A, and 3B indicates a pressurizing mechanism for pressurizing the ink in the refill 1B. The pressurizing mechanism 3A is composed of a cylinder part 4A and a piston part 5A, and the pressurizing mechanism 3B is composed of a cylinder part 4B and a piston part 5B.

  Further, in FIG. 1, reference numeral 8A denotes a first knock member that moves the refill 1A to the front end side (lower side in FIG. 1) and is pushed down to the front end side (lower side in FIG. 1) to operate the pressurizing mechanism 3A. 8B shows a first knock member that moves the refill 1B to the front end side (lower side in FIG. 1) and is pushed down to the front end side (lower side in FIG. 1) to operate the pressurizing mechanism 3B. Yes. 9A shows a second knock member integrated with the first knock member 8A, and 9B shows a second knock member integrated with the first knock member 8B.

  In FIG. 1, reference numeral 10 denotes a housing. Although not shown in detail in FIG. 1, in order to facilitate assembly of the refills 1A and 1B, the pressurizing mechanisms 3A and 3B, the first knock members 8A and 8B, the second knock members 9A and 9B, etc. The housing 10 is configured to be divided into a plurality of members. More specifically, the plurality of members are configured to be coupled by, for example, screwing.

  Furthermore, in FIG. 1, 11A shows the 1st spring for urging | biasing the cylinder part 4A of the refill 1A and the pressurization mechanism 3A to the rear end side (upper side of FIG. 1), 11B shows the refill 1B and pressurization The 1st spring for urging | biasing the cylinder part 4B of the mechanism 3B to the rear-end side (upper side of FIG. 1) is shown. The first spring 11A and the first spring 11B are configured similarly. Reference numeral 12A denotes a second spring for biasing the knock members 8A and 9A and the piston portion 5A of the pressurizing mechanism 3A to the rear end side (upper side in FIG. 1), and 12B denotes the knock members 8B and 9B and the pressurizing member. The 2nd spring for urging | biasing the piston part 5B of the mechanism 3B to the rear-end side (upper side of FIG. 1) is shown. The second spring 12A and the second spring 12B are configured similarly.

  In FIG. 1, reference numeral 13 denotes a canopy attached to the rear end portion (upper end portion of FIG. 1) of the housing 10, 14 denotes a clip member, and 15 denotes the clip member 14. The pin for attaching to 13 is shown. The clip member 14 is configured to be rotatable about a pin 15, and the free end (the lower end portion of FIG. 2B) of the clip member 14 (see FIG. 2B) is a leaf spring (see FIG. (Not shown) is biased toward the outer peripheral surface side of the housing 10 (from the back side to the front side in FIG. 1).

  Further, in FIG. 1, reference numeral 16 denotes a spring seat member for supporting the front end portions (lower end portions in FIG. 1) of the first springs 11A and 11B, and reference numeral 17 denotes the rear end side of the cylinder portions 4A and 4B. The abutting member for restricting the movement to (upper side of FIG. 1) is shown.

  2 and 3 are part diagrams of a plurality of parts constituting the ballpoint pen of the first embodiment shown in FIG. Specifically, FIG. 2A is a component diagram of the housing 10, FIG. 2B is a component diagram of the clip member 14, FIG. 2C is a component diagram of the crown 13, and FIG. FIG. 2E is a component diagram of the spring seat member 16. 3A is a component diagram of the second knock member 9A, FIG. 3B is a component diagram of the first knock member 8A, and FIG. 3C is a part of the piston portion 5A of the pressurizing mechanism 3A. FIG. 3D is a component diagram of a seal member 7A constituting a part of the piston portion 5A of the pressurizing mechanism 3A, and FIG. 3E is a cylinder portion 4A of the pressurizing mechanism 3A. FIG. 3F is a component diagram of the refill 1A integrated with the chip 2A.

  2A, reference numeral 10-1 denotes a spring seat member attaching portion for attaching the spring seat member 16 (see FIG. 2E) to the housing 10 by, for example, press-fitting, adhesion or the like. Reference numeral 10-2 denotes an abutting member attaching portion for attaching an abutting member (see FIG. 2D) to the housing 10 by, for example, press fitting or adhesion. 10-3A shows a groove for moving the second knock member 9A in the vertical direction of FIG. 1, and 10-3B shows a groove for moving the second knock member 9B in the vertical direction of FIG. Yes. Reference numeral 10-4A denotes an abutting portion for restricting the movement of the first knock member 8A toward the rear end side (the upper side in FIG. 1), and 10-4B denotes the rear end side of the first knock member 8B (see FIG. The abutting part for restricting the movement to the upper side of 1 is shown.

  Further, in FIG. 2A, 10-5A is such that the first knock member 8A pushed down to the front end side (lower side in FIG. 1) is not returned to the rear end side (upper side in FIG. 1) by the second spring 12A. 10-5B shows a locking portion for locking the first knock member 8A, and 10-5B is a rear end of the first knock member 8B pushed down to the front end side (lower side in FIG. 1) by the second spring 12B. The latching | locking part for latching the 1st knock member 8B so that it may not return to the side (upper side of FIG. 1) is shown. 10-6A shows a guide surface for guiding the first knock member 8A in the vertical direction of FIG. 1, and 10-6B shows a guide surface for guiding the first knock member 8B in the vertical direction of FIG. Show. 10-7 is a hole formed in the rear end portion (upper end portion in FIG. 1) of the housing 10 for attaching the crown 13 (see FIG. 2C) to the housing 10 by press-fitting, bonding or the like. Show. Reference numeral 10-8 denotes a hole formed in the front end portion of the housing 10 (lower end portion in FIG. 1).

  In FIG. 3A, 9A1 indicates an operation unit operated by the user when the first knock member 8A and the second knock member 9A are pushed down to the distal end side (lower side in FIG. 1). 9A2 shows an engaging portion 9A2 for attaching the second knock member 9A to the first knock member 8A. The second knock member 9B (see FIG. 1) is configured in substantially the same manner as the second knock member 9A shown in FIG.

  In FIG. 3 (B), 8A1 shows the front end of the first knock member 8A, and 8A2 shows a spring seat for supporting the rear end (upper end in FIG. 1) of the second spring 12A. ing. 8A3 is an abutting portion that abuts against the abutting portion 10-4A (see FIG. 2A) of the housing 10 in order to restrict movement of the first knock member 8A toward the rear end side (the upper side in FIG. 1). Show. 8A4 is a locking portion 10-5A (in the housing 10) so that the first knocking member 8A pushed down to the front end side (lower side in FIG. 1) is not returned to the rear end side (upper side in FIG. 1) by the second spring 12A. The latching | locking part latched in FIG. 2 (A) is shown. Reference numeral 8A5 denotes a guided surface that is slid with the guide surface 10-6A (see FIG. 2A) of the housing 10 when the first knocking member 8A moves in the vertical direction of FIG.

  Further, in FIG. 3B, 8A6 is a first knock member 8B for releasing the state (see FIG. 5B) in which the first knock member 8B is pushed down to the tip side (the lower side in FIG. 1). The pushing portion for pushing the pushed portion 8B7 (see FIG. 3B) is shown. 8A7 is a pushing portion 8B6 of the first knock member 8B (FIG. 3 (FIG. 3 (B)) for releasing the state (see FIG. 1 (B)) in which the first knock member 8A is pushed down to the tip side (lower side of FIG. 1). B) shows a driven part that is pushed by (see). Reference numeral 8A8 denotes an engagement hole that is engaged with the engagement portion 9A2 (see FIG. 3A) of the second knock member 9A in order to integrate the first knock member 8A and the second knock member 9A. .

  The first knock member 8B (see FIG. 1) is configured similarly to the first knock member 8A shown in FIG. 3 (B).

  In FIG. 3C, 6A1 indicates a hole into which the tip 8A1 (see FIG. 3B) of the first knock member 8A is press-fitted, and 6A2 indicates the tip of the piston body 6A. Reference numeral 6A3 denotes an abutting portion for restricting movement of the piston main body 6A and the seal member 7A toward the distal end side (lower side in FIG. 1) with respect to the cylinder portion 4A. A piston main body constituting a part of the piston portion 5B (see FIG. 1) is configured in the same manner as the piston main body 6A shown in FIG.

  3D, 7A1 indicates a hole into which the tip 6A2 (see FIG. 3C) of the piston main body 6A is press-fitted, 7A2 indicates an outer peripheral surface of the seal member 7A, and 7A3 indicates a seal. The front end surface of the member 7A is shown. The seal member 7A is formed of an elastic body such as rubber. Moreover, the sealing member which comprises a part of piston part 5B (refer FIG. 1) is comprised similarly to the sealing member 7A shown in FIG.3 (D).

  In FIG. 3E, 4A1 indicates a spring seat portion for supporting the front end portion (lower end portion of FIG. 1) of the second spring 12A, and 4A2 indicates the rear end portion of the first spring 12A (see FIG. 3). 1 shows a spring seat for supporting the upper end 1 of FIG. Reference numeral 4A3 denotes an abutting portion that abuts against the abutting member 17 (see FIG. 1) in order to restrict movement of the cylinder portion 4A toward the rear end side (upper side in FIG. 1). The abutting portion 4A3 is an abutting against which the abutting portion 6A3 of the piston main body 6A is abutted in order to restrict the movement of the piston main body 6A and the seal member 7A toward the front end side (lower side in FIG. 1) with respect to the cylinder portion 4A. It also has a function as a part.

  In FIG. 3E, 4A4 indicates the inner peripheral surface of the cylinder portion 4A for forming a seal surface in cooperation with the outer peripheral surface 7A2 (see FIG. 3D) of the seal member 7A. 4A5 shows a seating surface of the cylinder part 4A, and 4A6 shows a tip part of the cylinder part 4A that is press-fitted into the rear end part (upper end part in FIG. 1) of the refill 1A (see FIG. 3F). Yes. The cylinder part 4B (see FIG. 1) is configured similarly to the cylinder part 4A shown in FIG.

  In the ballpoint pen of the first embodiment, as shown in FIGS. 1 and 3, the second knock member 9A, the first knock member 8A, the piston main body 6A constituting the piston portion 5A, and the seal member 7A, They are integrated so that they move together. Further, the cylinder portion 4A, the refill 1A, and the tip 2A are integrated so that they move together. Similarly, the second knock member 9B, the first knock member 8B, the piston body constituting the piston portion 5B, and the seal member are integrated so that they move together. Yes. Further, the cylinder portion 4B, the refill 1B, and the tip 2B are integrated so that they move together.

  FIG. 4 is a diagram for explaining the process from the state shown in FIG. 1A to the state shown in FIG. Specifically, FIG. 4 is a cross-sectional view of the cylinder portion 4A, the piston portion 5A, the refill 1A, and the like shown in FIG. 1 as viewed from the left side of FIG. More specifically, FIG. 4A is an enlarged view of the cylinder portion 4A, the piston portion 5A, the refill 1A, and the like in the state shown in FIG. 4B is an enlarged view of the cylinder portion 4A, the piston portion 5A, the refill 1A, etc. at the timing between the state shown in FIG. 1A and the state shown in FIG. is there. FIG. 4C is an enlarged view of the cylinder portion 4A, the piston portion 5A, the refill 1A, and the like in the state shown in FIG. 1B.

  In the state shown in FIG. 1 (A) and FIG. 4 (A), the integrated second knock member 9A, first knock member 8A, piston main body 6A constituting the piston portion 5A, and seal The member 7A is completely returned to the rear end side (upper side in FIG. 1). Specifically, the abutting portion 8A3 (see FIGS. 3B and 4B) of the first knock member 8A is in contact with the abutting portion 10-4A of the housing 10 (FIGS. 2A and 4B). ))).

  Further, in the state shown in FIGS. 1 (A) and 4 (A), the cylinder portion 4A, the refill 1A, and the tip 2A that are integrated together are on the rear end side (upper side in FIG. 1). It has been completely returned. Specifically, the butting member 4A3 (see FIGS. 3E and 4B) of the cylinder portion 4A is a butting member 17 (FIGS. 1A and 4B) attached to the housing 10. See).

  In the ballpoint pen of the first embodiment, in the state shown in FIGS. 1 (A) and 4 (A), the tip 2A is housed in the housing 10, and the piston portion 5A is on the rear end side with respect to the cylinder portion 4A. (The upper side of FIG. 1), and thereby the pressure inside the cylinder portion 4 </ b> A and the inside of the refill 1 </ b> A communicated with the cylinder portion 4 </ b> A is reduced. The positions of (B) and FIG. 4 (B)) and the abutting member 17 (see FIG. 1 (A) and FIG. 4 (B)) are set. That is, in the ballpoint pen of the first embodiment, the pressure of the ink in the refill 1A is released in the state shown in FIGS. 1 (A) and 4 (A). Similarly, the pressurization of the ink in the refill 1B is also released.

  In the ballpoint pen according to the first embodiment, the second knock member 9A, the first knock member 8A, and the piston portion 5A that are integrated from the state shown in FIG. 1 (A) and FIG. 4 (A). When the piston main body 6A and the seal member 7A constituting it are pushed down to the tip side (lower side in FIG. 1), the cylinder portion 4A, the refill 1A, and the tip 2A that are integrated together are the most tip side. Before the ink is moved to the lower side (see FIG. 1) (see FIG. 1B), the pressurization of the ink in the refill 1A is completed.

  Specifically, in the ballpoint pen of the first embodiment, the cylinder portion 4A, the refill 1A, and the tip 2A that are integrated are moved to the most distal side (lower side in FIG. 1) ( (See FIG. 1B) In order to complete the pressurization of the ink in the refill 1A, the spring constant of the second spring 12A is made smaller than the spring constant of the first spring 11A. .

  In other words, in the ballpoint pen according to the first embodiment, the first knock member 8A or the like starts to be pushed down from the state shown in FIGS. 1 (A) and 4 (A) to the tip side (the lower side in FIG. 1). Then, as the amount of depression of the first knock member 8A or the like increases, the amount of contraction of the second spring 12A increases rapidly, and the amount of contraction of the first spring 11A gradually increases. The spring constant of the spring 12A and the spring constant of the first spring 11A are set.

  That is, in the ballpoint pen of the first embodiment, the cylinder portion 4A, the refill 1A, and the tip 2A that are integrated are moved to the most distal side (lower side in FIG. 1) (FIG. 1). 4B), the abutting portion 6A3 of the piston body 6A (see FIG. 3C and FIG. 4A) is the abutting portion of the cylinder portion 4A. 4A3 (see FIG. 3E and FIG. 4A), and pressurization of the ink in the refill 1A is completed.

  From the state shown in FIG. 4 (B), the second knock member 9A, the first knock member 8A, the piston main body 6A constituting the piston portion 5A, and the seal member 7A are integrated on the front end side. When it is further pushed down (lower side in FIG. 1), the amount of contraction of the first spring 11A further increases, and as shown in FIGS. 1B and 4C, the cylinder portion 4A that is integrated is integrated. Then, the refill 1A and the tip 2A are moved to the most distal side (lower side in FIG. 1).

  Specifically, in the state shown in FIGS. 1B and 4C, the locking portion 8A4 (see FIG. 3B) of the first knock member 8A is the locking portion 10-5A of the housing 10. (See FIG. 2A). As a result, the integrated second knock member 9A, first knock member 8A, piston main body 6A constituting the piston portion 5A, and seal member 7A are on the distal end side (lower side in FIG. 1). The fully depressed state is maintained. Further, the cylinder portion 4A, the refill 1A, and the tip 2A that are integrated together are the most distal side (see FIG. 3C and FIG. 4A) of the piston body 6A by the abutting portion 6A3 (see FIGS. 3C and 4A). 1) is maintained.

  Next, when writing with the ink in the refill 1A is completed and the chip 2A needs to be stored in the housing 10, the second knock member 9B is moved from the state shown in FIG. (Lower side in FIG. 1). As a result, the pushed portion 8A7 of the first knock member 8A is pushed to the lower left side in FIG. 1B by the pushing portion 8B6 (see FIG. 3B) of the first knock member 8B. Accordingly, the locking portion 8A4 (see FIG. 3B) of the first knock member 8A is disengaged from the locking portion 10-5A (see FIG. 2A) of the housing 10. As a result, the integrated second knock member 9A, first knock member 8A, piston body 6A constituting the piston portion 5A, and seal member 7A are in the state shown in FIG. The second spring 12A is completely returned to the rear end side (upper side in FIG. 1). Further, the cylinder portion 4A, the refill 1A, and the tip 2A that are integrated are completely moved to the rear end side (upper side in FIG. 1) by the first spring 11A until the state shown in FIG. Returned to That is, the pressurization of the ink in the refill 1A is released.

  As described above, in the ballpoint pen according to the first embodiment, when the knock members 8A and 9A are pushed down to the tip side (the lower side in FIG. 1) from the state shown in FIGS. 1 (A) and 4 (A). First, as shown in FIG. 4B, pressurization of the ink in the refill 1A is completed by the pressurization mechanism 3A (4A, 5A, 6A, 7A). Next, as shown in FIGS. 1B and 4C, when the knock members 8A and 9A are further pushed down to the tip side (the lower side in FIG. 1), the refill 1A is moved to the tip side.

  In other words, in the ballpoint pen according to the first embodiment, the knock members 8A and 9A are completely pushed down to the tip side (the lower side in FIG. 1) and are in the state shown in FIG. 1 (B) and FIG. 4 (C). Before the pressurization of the ink in the refill 1A is completed by the pressurization mechanism 3A (4A, 5A, 6A, 7A) as shown in FIG. 4B. Thereafter, as shown in FIGS. 1 (B) and 4 (C), the knock members 8A and 9A are further pushed down to the tip side (lower side of FIG. 1), so that the refill 1A is moved to the tip side (lower side of FIG. 1). Side).

  Therefore, according to the ballpoint pen of the first embodiment, the knock members 8A, 9A are completely pushed down to the tip side (lower side in FIG. 1), and the refill 1A moves to the tip side (lower side in FIG. 1). When completed, that is, the locking portion 8A4 (see FIG. 3B) of the first knock member 8A is locked to the locking portion 10-5A (see FIG. 2A) of the housing 10. Sometimes, the risk that the ink in the refill 1A is not sufficiently pressurized can be eliminated.

  In the ballpoint pen of the first embodiment, in order to eliminate the possibility that the ink in the refill 1A is not sufficiently pressurized when the knock members 8A and 9A are completely pushed down to the tip side (the lower side in FIG. 1). As described above, the spring constant of the second spring 12A is made smaller than the spring constant of the first spring 11A.

  Specifically, in the ballpoint pen according to the first embodiment, the knock members 8A and 9A are moved from the state shown in FIG. 1A and FIG. ), First, as shown in FIG. 4 (B), the abutting portion 6A3 of the piston body 6A (see FIG. 3 (C) and FIG. 4 (A)) becomes the abutting portion of the cylinder portion 4A. The second spring 12A is compressed until it hits 4A3 (see FIGS. 3E and 4A), whereby the pressurization of the ink in the refill 1A is completed, and then the first pressing force is applied. When the knock members 8A and 9A are further pushed down to the tip side (the lower side in FIG. 1) with a larger second pressing force, the first spring 11A is moved as shown in FIGS. 1 (B) and 4 (C). Compressed so that refill 1A comes first Side so as to be moved in the (lower side in FIG. 1), the spring constant of the second spring 12A is smaller than the spring constant of the first spring 11A.

  That is, according to the ballpoint pen of the first embodiment, the knock members 8A and 9A are moved to the tip side (lower side of FIG. 1) by a simple method of managing the spring constant of the first spring 11A and the spring constant of the second spring 12A. The possibility that the ink in the refill 1A is not sufficiently pressurized when fully pressed down to the side) can be eliminated.

  In the ballpoint pen of the first embodiment, as shown in FIGS. 1 and 4, the tip end portion (lower end portion of FIG. 1) of the first spring 11 </ b> A is supported by the spring seat member 16 fixed to the housing 10, The rear end portion (upper end portion in FIG. 1) of the first spring 11A is supported by the spring seat portion 4A2 (see FIG. 3 (E)) of the cylinder portion 4A, and the front end portion (lower side in FIG. 1) of the second spring 12A. End) is supported by the spring seat portion 4A1 (see FIG. 3E) of the cylinder portion 4A, and the rear end portion (upper end portion in FIG. 1) of the second spring 12A is the spring seat portion of the first knock member 8A. 8A2 (see FIG. 3B). That is, in the ballpoint pen of the first embodiment, in order to prevent the outer diameter of the ballpoint pen from increasing, the tip of the second spring 12A (the lower end of FIG. 1) is the housing 10 or the housing 10. Rather than being supported by a spring seat member (not shown) fixed to the cylinder, it is supported by a spring seat portion 4A1 (see FIG. 3E) of the cylinder portion 4A having a smaller diameter.

  In the ballpoint pen of the first embodiment configured as described above, if the spring constant of the second spring 12A is larger than the spring constant of the first spring 11A due to manufacturing variations or the like, the knock members 8A and 9A When the second spring 12A is completely pushed down to the tip side (lower side in FIG. 1), the second spring 12A is not sufficiently compressed, and accordingly, the ink in the refill 1A may not be sufficiently pressurized. .

  Therefore, in the ballpoint pen of the first embodiment, the second spring 12A is sufficiently compressed when the knock members 8A and 9A are completely pushed down to the tip side (the lower side in FIG. 1). The spring constant of the second spring 12A is smaller than the spring constant of the first spring 11A.

  That is, in the ballpoint pen of the first embodiment, the tip of the second spring 12A (the lower end in FIG. 1) is used as the spring seat 4A1 (see FIG. 1) of the cylinder 4A in order to suppress an increase in the outer diameter of the ballpoint pen. 3 (E)), the ink in the refill 1A may not be sufficiently pressurized when the knock members 8A and 9A are completely pushed down to the tip side (the lower side in FIG. 1). It is possible to reliably avoid the occurrence of.

  Hereinafter, a third embodiment of the ballpoint pen of the present invention will be described. The ballpoint pen of the third embodiment is configured in substantially the same manner as the ballpoint pen of the first embodiment described above, except for the points described below.

  FIG. 5 is a cross-sectional view of the ballpoint pen of the third embodiment. Specifically, FIG. 5A shows a state in which the ink in the refills 1A and 1B is not pressurized, and FIG. 5B shows that the ink in the refill 1A is not pressurized and the refill 1B. It is the figure which showed the state in which the inside ink is pressurized. 5, the same reference numerals as those shown in FIGS. 1 to 4 indicate the same parts or portions as the parts or parts shown in FIGS.

  In FIG. 5, 11A ′ indicates a first spring for urging the refill 1A and the cylinder portion 4A of the pressurizing mechanism 3A toward the rear end side (upper side in FIG. 5), and 11B ′ indicates the refill 1B and The 1st spring for urging | biasing the cylinder part 4B of the pressurization mechanism 3B to the rear-end side (upper side of FIG. 5) is shown. The first spring 11A 'and the first spring 11B' are configured similarly. Reference numeral 12A ′ denotes a second spring for urging the knock members 8A and 9A and the piston portion 5A of the pressurizing mechanism 3A toward the rear end side (upper side in FIG. 5), and 12B ′ denotes the knock members 8B and 9B and The 2nd spring for urging | biasing the piston part 5B of the pressurization mechanism 3B to the rear-end side (upper side of FIG. 5) is shown. The second spring 12A and the second spring 12B are configured similarly.

  Further, in FIG. 5, reference numeral 20 denotes an abutting member for restricting movement of the cylinder portions 4 </ b> A and 4 </ b> B to the tip side (lower side in FIG. 5).

  That is, in the ballpoint pen of the third embodiment, the position at which the integrated cylinder portion 4A, refill 1A, and tip 2A are moved to the most distal side (lower side in FIG. 5) is the abutting member 20. Is set by. Similarly, the abutting member 20 sets a position where the cylinder portion 4B, the refill 1B, and the tip 2B that have been integrated are moved to the most distal side (lower side in FIG. 5).

  Furthermore, in the ballpoint pen of the third embodiment, the second pen is integrated so that the ink in the refill 1A moved to the most distal side (the lower side in FIG. 5) can be sufficiently pressurized. The knock member 9A, the first knock member 8A, the piston body 6A (see FIG. 3C) constituting the piston portion 5A, and the seal member 7A (see FIG. 3D) are on the distal end side (lower side in FIG. 5). The position fully pushed down is set by the locking portion 10-4A of the housing 10 (see FIG. 2A). Similarly, the second knock member 9B and the first knock member integrated together so that the ink in the refill 1B moved to the most distal side (lower side in FIG. 5) can be sufficiently pressurized. 8B and the piston body (not shown, see FIG. 3C) and the seal member (not shown, see FIG. 3D) constituting the piston portion 5B are completely on the tip side (lower side in FIG. 5). The position pushed down is set by the locking portion 10-4B of the housing 10 (see FIG. 2A).

  Specifically, in the ballpoint pen of the third embodiment, as shown in FIG. 5B, the second knock member 9B, the first knock member 8B, and the piston constituting the piston portion 5B are integrated. When the main body (not shown, see FIG. 3C) and the seal member (not shown, see FIG. 3D) are completely pushed down to the tip side (lower side in FIG. 5), the cylinder portion 4B is abutted against the abutting member 20, and the piston portion 5B is sufficiently moved to the tip side (lower side in FIG. 5) with respect to the cylinder portion 4B. As a result, the ink in the refill 1B is sufficiently pressurized.

  Similarly, in the ballpoint pen of the third embodiment, the integrated second knock member 9A, the first knock member 8A, and the piston main body 6A constituting the piston portion 5A (see FIG. 3C) When the seal member 7A (see FIG. 3D) is completely pushed down to the tip side (the lower side of FIG. 5) (not shown, see FIG. 1B), the cylinder portion 4A abuts. The piston portion 5A is abutted against the member 20, and is sufficiently moved to the tip side (lower side in FIG. 5) with respect to the cylinder portion 4A. As a result, the ink in the refill 1A is sufficiently pressurized.

  As described above, in the ballpoint pen according to the third embodiment, the abutting member 20 is provided, thereby ensuring that the ink in the refills 1A and 1B is sufficiently pressurized. Therefore, in the ballpoint pen of the third embodiment, the spring constant of the second spring 12A ′ may be equal to, smaller than, or larger than the spring constant of the first spring 11A ′. . Further, the spring constant of the second spring 12B ′ (see FIG. 5) may be equal to, smaller than, or greater than the spring constant of the first spring 11B ′ (see FIG. 5). good.

  In other words, in the ballpoint pen of the third embodiment, the knock member 8A from the position returned to the rear end side (upper side in FIG. 5) to the position completely pushed down to the front end side (lower side in FIG. 5), The difference Δ between the stroke amount S1 of 9A and the stroke amount S2 of the refill 1A from the position returned to the rear end side (upper side in FIG. 5) to the position moved to the most front end side (lower side in FIG. 5) Cylinder integrated with refill 1A so that (S1-S2) is greater than or equal to stroke amount S3 of piston portion 5A with respect to cylinder portion 4A of pressurizing mechanism 3A required for pressurizing ink in refill 1A. An abutting member 20 is provided as a restricting means for restricting movement of the portion 4A toward the distal end side (the lower side in FIG. 5).

  Specifically, in the ballpoint pen of the third embodiment, the knock members 8A and 9A are completely pushed down to the tip side (lower side in FIG. 5), and the refill 1A is moved to the most tip side (lower side in FIG. 5). When the movement of the cylinder portion 4A integrated with the refill 1A to the tip side (the lower side in FIG. 5) is restricted by the abutting member 20 (not shown, see FIG. 1B) Further, the stroke amount Δ (S1-S2) of the piston portion 5A with respect to the cylinder portion 4A is equal to or larger than the stroke amount S3 necessary for pressurizing the ink in the refill 1A.

  Therefore, according to the ballpoint pen of the third embodiment, the knock members 8A, 9A are provided by a simple method of providing the abutting member 20 for restricting the movement of the refill 1A toward the tip side (the lower side in FIG. 5). When the ink is completely pushed down to the tip side (the lower side in FIG. 5), the risk that the ink in the refill 1A is not sufficiently pressurized can be eliminated.

  Further, in the ballpoint pen of the third embodiment, the knock members 8B and 9B from the position returned to the rear end side (upper side in FIG. 5) to the position completely pushed down to the front end side (lower side in FIG. 5) Difference Δ (S1) between the stroke amount S1 and the stroke amount S2 of the refill 1B from the position returned to the rear end side (upper side in FIG. 5) to the position moved to the most front end side (lower side in FIG. 5) The cylinder part 4B integrated with the refill 1B so that -S2) is equal to or greater than the stroke amount S3 of the piston part 5B with respect to the cylinder part 4B of the pressurizing mechanism 3B required to pressurize the ink in the refill 1B. The movement toward the tip side (the lower side in FIG. 5) is regulated by the abutting member 20.

  Specifically, in the ballpoint pen according to the third embodiment, as shown in FIG. 5B, the knock members 8B and 9B are completely pushed down to the tip side (the lower side in FIG. 5), and the refill 1B is the most tip side. When the movement of the cylinder portion 4B, which is moved to the lower side of FIG. 5 and integrated with the refill 1B, to the tip side (lower side of FIG. 5) is restricted by the abutting member 20, the cylinder The stroke amount Δ (S1-S2) of the piston portion 5B with respect to the portion 4B is equal to or larger than the stroke amount S3 required for pressurizing the ink in the refill 1B.

  Therefore, according to the ballpoint pen of the third embodiment, the knock members 8B, 9B are provided by a simple method of providing the abutting member 20 for restricting the movement of the refill 1B to the tip side (the lower side in FIG. 5). When the ink is completely pushed down to the tip side (the lower side in FIG. 5), the risk that the ink in the refill 1B is not sufficiently pressurized can be eliminated.

  Hereinafter, a fourth embodiment of the ballpoint pen of the present invention will be described. The ball-point pen of the fourth embodiment is configured in substantially the same manner as the ball-point pen of the third embodiment described above except for the points described below.

  FIG. 6 is a cross-sectional view of the ballpoint pen of the fourth embodiment. Specifically, FIG. 6A shows a state in which the ink in the refills 1A and 1B is not pressurized, and FIG. 6B shows that the ink in the refill 1A is not pressurized and the refill 1B. It is the figure which showed the state in which the inside ink is pressurized. In FIG. 6, the same reference numerals as those shown in FIGS. 1 to 5 indicate the same parts or portions as the parts or parts shown in FIGS.

  In FIG. 6, reference numeral 20 ′ denotes an abutting member for restricting the movement of the refills 1 </ b> A and 1 </ b> B to the tip side (the lower side of FIG. 6).

  That is, in the ballpoint pen of the fourth embodiment, the cylinder portion 4A, the refill 1A, and the tip 2A that have been integrated are integrated with the position where the tip end side (lower side in FIG. 6) is moved. The position where the cylinder portion 4B, the refill 1B, and the tip 2B are moved to the most distal side (the lower side in FIG. 6) is a single abutting member disposed at the joining portion of the refill 1A and the refill 1B. 20 '.

  Furthermore, in the ballpoint pen of the fourth embodiment, the ink in the refill 1A moved to the most distal side (the lower side in FIG. 6) can be sufficiently pressurized as in the ballpoint pen of the third embodiment. As described above, the second knock member 9A, the first knock member 8A, the piston body 6A (see FIG. 3C) and the seal member 7A (see FIG. 3D) constituting the piston portion 5A are integrated. The position where the and are completely pushed down to the tip side (the lower side in FIG. 6) is set by the locking portion 10-4A (see FIG. 2A) of the housing 10. Similarly, the second knock member 9B and the first knock member integrated together so that the ink in the refill 1B moved to the most distal side (the lower side in FIG. 6) can be sufficiently pressurized. 8B and the piston body (not shown, see FIG. 3C) and the seal member (not shown, see FIG. 3D) constituting the piston portion 5B are completely on the tip side (lower side in FIG. 6). The position pushed down is set by the locking portion 10-4B of the housing 10 (see FIG. 2A).

  Specifically, in the ballpoint pen according to the fourth embodiment, as shown in FIG. 6B, the second knock member 9B, the first knock member 8B, and the piston constituting the piston portion 5B are integrated. When the main body (not shown, see FIG. 3C) and the seal member (not shown, see FIG. 3D) are completely pushed down to the tip side (the lower side in FIG. 6), the refill 1B Is abutted against the abutting member 20 ′, and the piston portion 5B is sufficiently moved to the tip side (the lower side in FIG. 6) with respect to the cylinder portion 4B. As a result, the ink in the refill 1B is sufficiently pressurized.

  Similarly, in the ballpoint pen of the fourth embodiment, the integrated second knock member 9A, the first knock member 8A, and the piston main body 6A constituting the piston portion 5A (see FIG. 3C) When the seal member 7A (see FIG. 3D) is completely pushed down to the tip side (the lower side of FIG. 6) (not shown, see FIG. 1B), the refill 1A is abutting member The piston portion 5A is sufficiently moved to the tip side (lower side in FIG. 6) with respect to the cylinder portion 4A. As a result, the ink in the refill 1A is sufficiently pressurized.

  In other words, in the ballpoint pen of the fourth embodiment, the knock member 8A from the position returned to the rear end side (upper side in FIG. 6) to the position completely pushed down to the front end side (lower side in FIG. 6), The difference Δ between the stroke amount S1 of 9A and the stroke amount S2 of the refill 1A from the position returned to the rear end side (upper side in FIG. 6) to the position moved to the most front end side (lower side in FIG. 6) The tip side of the refill 1A (see FIG. 6) is such that (S1-S2) is greater than or equal to the stroke amount S3 of the piston 5A relative to the cylinder 4A of the pressurizing mechanism 3A required to pressurize the ink in the refill 1A. An abutting member 20 ′ is provided as a restricting means for restricting movement to the lower side.

  Specifically, in the ballpoint pen of the fourth embodiment, the knock members 8A and 9A are completely pushed down to the tip side (the lower side in FIG. 6), and the refill 1A is moved to the most tip side (the lower side in FIG. 6). When the movement of the refill 1A integrated with the cylinder portion 4A to the front end side (the lower side in FIG. 6) is restricted by the abutting member 20 ′ (not shown, see FIG. 1B) ), The stroke amount Δ (S1-S2) of the piston portion 5A with respect to the cylinder portion 4A is equal to or larger than the stroke amount S3 necessary for pressurizing the ink in the refill 1A.

  Therefore, according to the ballpoint pen of the fourth embodiment, the knock member 8A, by a simple method of providing the abutting member 20 ′ for restricting the movement of the refill 1A to the tip side (the lower side in FIG. 6). The possibility that the ink in the refill 1A is not sufficiently pressurized when 9A is completely pushed down to the tip side (the lower side in FIG. 6) can be eliminated.

  Furthermore, in the ballpoint pen of the fourth embodiment, the knock members 8B and 9B from the position returned to the rear end side (upper side in FIG. 6) to the position completely pushed down to the front end side (lower side in FIG. 6) A difference Δ (S1) between the stroke amount S1 and the stroke amount S2 of the refill 1B from the position returned to the rear end side (upper side in FIG. 6) to the position moved to the most distal side (lower side in FIG. 6). The refill 1B integrated with the cylinder portion 4B so that -S2) is greater than or equal to the stroke amount S3 of the piston portion 5B with respect to the cylinder portion 4B of the pressurizing mechanism 3B required to pressurize the ink in the refill 1B. The movement toward the tip side (the lower side in FIG. 6) is regulated by the abutting member 20 ′.

  Specifically, in the ballpoint pen of the fourth embodiment, as shown in FIG. 6B, the knock members 8B and 9B are completely pushed down to the tip side (the lower side in FIG. 6), and the refill 1B is the most tip side. When the movement of the refill 1B that is moved to (lower side in FIG. 6) and integrated with the cylinder portion 4B to the tip side (lower side in FIG. 6) is restricted by the abutting member 20 ′, The stroke amount Δ (S1-S2) of the piston portion 5B with respect to the cylinder portion 4B is equal to or larger than the stroke amount S3 necessary for pressurizing the ink in the refill 1B.

  Therefore, according to the ballpoint pen of the fourth embodiment, the knock member 8B, by a simple method of providing the butting member 20 ′ for restricting the movement of the refill 1B to the tip side (the lower side in FIG. 6). It is possible to eliminate the possibility that the ink in the refill 1B is not sufficiently pressurized when 9B is completely pushed down to the front end side (lower side in FIG. 6).

  Further, in the ballpoint pen of the fourth embodiment, as shown in FIG. 6, the abutting member 20 ′ for restricting the movement of the refills 1 </ b> A and 1 </ b> B toward the front end side (lower side in FIG. 6) (Disposed at the lower end of FIG. 6). Specifically, the abutting member 20 ′ is disposed at the tip portion of the housing 10 through which any of the plurality of refills 1 </ b> A and 1 </ b> B can pass. Therefore, the cost required to provide the abutting member 20 ′ is lower than the case where a plurality of abutting members are provided corresponding to each of the plurality of refills in order to regulate the movement of the plurality of refills to the tip side. Can be reduced.

  In the ballpoint pens of the first to fourth embodiments described above, when the ink in the refill 1A is sufficiently pressurized (see FIG. 1B), a seal member that constitutes a part of the piston portion 5A A seal surface is formed by the outer peripheral surface 7A2 (see FIG. 3D) of 7A and the inner peripheral surface 4A4 (see FIG. 3E) of the cylinder portion 4A, and the ink in the refill 1B is sufficiently added. When pressed (see FIG. 5B and FIG. 6B), the outer peripheral surface (not shown) of the seal member constituting a part of the piston portion 5B and the inner peripheral surface of the cylinder portion 4B (Not shown) forms a sealing surface.

  On the other hand, in the ballpoint pen of the fifth embodiment, when the ink in the refill 1A is sufficiently pressurized (see FIG. 1B), the outer periphery of the seal member 7A constituting a part of the piston portion 5A. A first seal surface is formed by the surface 7A2 (see FIG. 3D) and the inner peripheral surface 4A4 (see FIG. 3E) of the cylinder portion 4A, and the tip surface 7A3 of the seal member 7A (see FIG. 3D). It is also possible to form the second seal surface by two planes, that is, D) and a seating surface 4A5 of the cylinder portion 4A (see FIG. 3E).

  Further, in the ballpoint pen of the fifth embodiment, when the ink in the refill 1B is sufficiently pressurized (see FIGS. 5B and 6B), a part of the piston portion 5B is configured. A first seal surface is formed by the outer peripheral surface (not shown) of the sealing member to be performed and the inner peripheral surface (not shown) of the cylinder portion 4B, and the tip end surface (not shown) of the seal member, and the cylinder portion It is also possible to form the second sealing surface by two planes with a 4B seating surface (not shown).

  In other words, according to the ballpoint pen of the fifth embodiment, compared to the ballpoint pen described in Japanese Patent Application Laid-Open No. 2004-314379 in which the seal surface for pressurizing the ink in the refill is configured only by a curved surface (cylindrical surface). The reliability of the sealing surface can be improved.

  In the ballpoint pens of the first to fifth embodiments, two refills 1A and 1B are provided, but in the ballpoint pen of the sixth embodiment, it is possible to provide three or more refills.

  In the ballpoint pen according to the seventh embodiment, the ballpoint pens according to the first to sixth embodiments described above can be appropriately combined.

It is sectional drawing of the ball-point pen of 1st Embodiment. FIG. 2 is a component diagram of a plurality of components constituting the ballpoint pen according to the first embodiment shown in FIG. 1. FIG. 2 is a component diagram of a plurality of components constituting the ballpoint pen according to the first embodiment shown in FIG. 1. It is a figure for demonstrating the process from the state shown to FIG. 1 (A) to the state shown to FIG. 1 (B). It is sectional drawing of the ball-point pen of 3rd Embodiment. It is sectional drawing of the ball-point pen of 4th Embodiment.

Explanation of symbols

1A, 1B Refill 2A, 2B Tip 3A, 3B Pressure mechanism 4A, 4B Cylinder part 5A, 5B Piston part 6A, 6B Piston body 7A, 7B Seal member 8A, 8B First knock member 9A, 9B Second knock member 10 Housing 11A, 11B 1st spring 12A, 12B 2nd spring 13 Caps 14 Clip member 15 Pin 16 Spring seat member 17 Abutting member

Claims (6)

  A ballpoint pen comprising a plurality of refills, a pressurizing mechanism for pressurizing ink in the refills, and a knock member that moves the refills to the tip side and is pushed down to the tip side to operate the pressure mechanism. In this case, when the knock member is pushed down to the front end side, first, the pressurization of the ink in the refill is completed by the pressurizing mechanism, and then, when the knock member is further pushed down to the front end side, A ballpoint pen characterized in that the refill is moved to the tip side.   A ballpoint pen comprising a plurality of refills, a pressurizing mechanism for pressurizing ink in the refills, and a knock member that moves the refills to the tip side and is pushed down to the tip side to operate the pressure mechanism. A first spring for biasing the refill and the cylinder portion of the pressurizing mechanism toward the rear end, and a second spring for biasing the knock member and the piston portion of the pressurizing mechanism toward the rear end. And a spring constant of the second spring is made smaller than that of the first spring.   The front end of the first spring is supported by a ballpoint pen housing or a spring seat fixed to the ballpoint pen housing, the rear end of the first spring is supported by the cylinder portion, and the front end of the second spring is supported by the cylinder portion. The ballpoint pen according to claim 3, wherein a rear end of the second spring is supported by the knock member or the piston portion.   A ballpoint pen comprising a plurality of refills, a pressurizing mechanism for pressurizing ink in the refills, and a knock member that moves the refills to the tip side and is pushed down to the tip side to operate the pressure mechanism. , The stroke amount of the knock member from the position returned to the rear end side to the position completely pushed down to the front end side, and the position moved from the position returned to the rear end side to the position most moved to the front end side. The refill is moved to the tip side so that the difference from the stroke amount of the refill is equal to or greater than the stroke amount of the piston portion with respect to the cylinder portion of the pressurizing mechanism required to pressurize the ink in the refill. A ballpoint pen provided with a regulating means for regulating.   The ballpoint pen according to claim 4, wherein the restricting means is disposed at a tip of the ballpoint pen housing.   6. A sealing surface for pressurizing ink in the refill is constituted by two planes of an end surface of a piston portion of the pressurizing mechanism and a seating surface of a cylinder portion of the pressurizing mechanism. The ball-point pen as described in any one of.

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